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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693ec6f6ffb5666ece770b8af01fc1914f5db374fa04e38d9f1761cf3c7b80d1' 
  AND token = 'EfEeBscCiTMphREz+dBXW8olqT2pobpvGr3/QOaJHTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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