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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa93ee82235d8186fa828a8e331bd3e0e75200dd2dba5b67edd4a65c707165e3' 
  AND token = 'OD5B9MSSyr/52K2odpO8H94UQBMN7znyYIMUeatcE/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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