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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71ea68603e3dd6634faad317b65b934e9d57e69e3801984cc6b2027508ff7ca' 
  AND token = 'eR7DxDEZ31z4K+6NN6sXe7AQxKp96LZ5+IFOuDxRHH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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