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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef723867809d92c4cc0ae1ca6693b2e9b2270f16dfbf8f3ad66797e77ae4f8bf' 
  AND token = 'xZyJVaf7c4yq6Jk6FzZALLx9D099EeQC92WIbYid7qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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