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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dce6baecc5e0a1f6ab9b84ca81aad0354017ed80c57f962275f7c61a9acc72e' 
  AND token = 'p14AgsZ3Xdv8qagtP4ZtD4vU0SluPGebQNn+QzmUsRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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