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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ca5e91dd062735bb9bd14ce401562bf107cb30abf3508fef2e6b3785dbc0bb' 
  AND token = 'Oi9fhSkNVlF+5gHrcqg5biFJDEjQATYvYQG7WjU2SSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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