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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307e0344192ada77d9a452f9b5013121016da4cc89f91c85f55595c22d29491f' 
  AND token = 'DkmfrrfJyoqTGSZSXxBXhp5wrQaN6hKAMNXD89XVcbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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