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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd70ce928a1d67b30ff818bc06ee3a005c3bc9e58ad081fa1549e0fc4f64865f' 
  AND token = 'qPhyqTPoo0phRgleF14AiRa8rt1SGW3Mv041e2Z73no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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