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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569f08e0f6420833293bf309f27db747cfc7d33d54192d699d4144e0faa8207c' 
  AND token = '079KkvQ054608UsBPIu64NpvUKO9FSIvqKBIV/yw2Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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