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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88602118546abe9038c6e2b89405b08c7266a0bbfc907a7b22c24c1df0ac9d7f' 
  AND token = 'Zh7TH5Gzs0MH5tyhu/7kOBLEUPmzl1gDbW3HMRCnXOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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