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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db85bbaa35163f6f5c1a59e19abe180ce2650d49a7eddd7d0efa42e3c7918b35' 
  AND token = 'Pd3dJdXT0F6NeSNJ5Ub+Kurp4bnuqfSnkIfJdnJ7GPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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