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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'defa471fe13e2352891e98664750d66fe5faeb37882503f715f740f405ca7ae8' 
  AND token = 'p7aM7Nvr0HmxUS8XIFaZ5gLna4is1r1TugzW4aZfE/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}