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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e0ead81c7ec1b2f92c455ad3d8e0df0cfaa8b9db4483988b9b8403e91cce2d5' 
  AND token = 'HeRiRgyJN+XVGjm5qNV88P1SpfAl+vprT8diRBpf4dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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