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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87effcb2ce3351fed33399ace4dda70f8d218437d98794d38b73c51341590497' 
  AND token = 'OoZgUucgjJxL5xoiGBH1T8pKxP2tPv2STqK9et1BK7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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