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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f7ad2d84f7bc675906a1e6f4ad56d9b7e9eaf3c700eb568f1aaf0b89015a31' 
  AND token = 'wsoBdkbJBYMvPcT4Ck426wAQCQqU0Gr/aW9dJ99pJKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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