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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8928def583265b1be8e9b7442146711b67c182e1762a7302754f62bdc1802c9c' 
  AND token = 'fHuNR/4//SHe+s8nn/TSGRaYeByY0hJ2gj5qlWQOhWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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