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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4931f14f48da206a4525cd22033e93b93e0e6c75afd3c3f46221a5d90ca9e5da' 
  AND token = 'x6KvvkVkunGC0cvFY1RH+j9xUYaW+gNJDypB2hYj9us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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