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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3beb86e0bea9bec413870390c94e0431f519d552c7d26b3d4a2b36cfabe278' 
  AND token = 'QKyQO5xVfFLa+2IeXvuQY07I14aaq0wGK8t+n3fNM+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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