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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a9afb19eb6915c8c058d3aff46c7eb8bc3f16475b593a4782cfc65e9886e6b' 
  AND token = 'EJaJUbpogRxrEtAe+UXL5EjMRHG7xfWIS4q3mV8H7ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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