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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07eff2a8a971d68c623f5989505981fc6bf2c57b85583ede7e5c259b984f00eb' 
  AND token = 'QLrm10lc6sEah48PmxnXklDB7IJAs6II2E/osCzrztU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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