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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da22d85882bd86eb23ec6c3c3995f8ac3293f80e94c90b4eb342e6744cfebd9' 
  AND token = 'rtmtKutJgK47n1IOw/rmUjFjFUNRE6eCnYl/NswErCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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