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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd326da58672389d19343a1f88e8109dd5afcb807b59c5f9fa39ab230c914dcd' 
  AND token = 'IuLduwpofpyqUB245//fU1eeGJKtd4xu6KwL8Xqzqes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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