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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1c9629d9258f78ab1230938c5d534cd05a48b94f3cd19457836cb0ce8cbbb9' 
  AND token = '9PLDrrfLqtRKYPXmZIeNmCech4iMn/ynpz+r3YaGu3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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