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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46e2511495b721f8797ff4d66fa79b67cca4f2771427ef2490cf6e2e6320485' 
  AND token = 'lFrpl8cECHv1EwyU1pc43Tml1PJpfSYAI5ibk3dPSY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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