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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696f6f4d3f9f5a3515be6f5a0001bdaf22ee8453cb7ccd87fcfb64043bf4050b' 
  AND token = '6CnAn64mwqfTZUFXmqsJ3rQmpVPtalhDUNs0WO7ctd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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