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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84188de0290fb4ba809444b75d29b0b1e23956cff06d5f93cf8bf1fba3447d00' 
  AND token = 'IrE1Gr2UKtLY8l7aXaiafM866Ozi67HY+mIXPcGTPWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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