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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5ec99f9c74dfa3d0f8526cd6a0c0daf76dc4dd7cdec34852cb9807f966f69c' 
  AND token = 'U2xNdzZ5BDBly6m0bt8lWmIP2dc+wZO9ibbgxxebNxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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