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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7458b6e6abddb76f0dc9f73e5db2b77956c1bceb31cff573b59037c859e7cff' 
  AND token = '+4hlNrV1x/4lyROG9g8a0WGnGSUuCsftbPEzLYEF15M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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