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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c66242f13c8b7ec97eea5dcd2e0aeba1bba3daa4669a30ca297b0da3ba591bd' 
  AND token = 'FD+JSW8rNJxzIiJiUeXN1nV7uNV5U3gu0BV81tOIrs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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