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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb661dd993e129c788d252e8c821585da45c2e7de97f87e49d9bc4d5de5deaa' 
  AND token = 'ZIncAqFwP2p6hJf13xdVPv5eBv/X/eqA4gJzrXLaaLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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