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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd597c873dffc686496c5672a723f2493dcb519bfa811c3aa5a6f5ceec6faac62' 
  AND token = 'YRLo5qcL7S0CLYSF0xrhvf3dbHfE3cSKTQ/D0SfSJfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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