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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e00b7a0246445a70bc81bcd2d459f72db7302981dd8afdf85bf381a8d4b1bf' 
  AND token = '4A8yRVBKZ+T+qmCw89qE/tpH5iGh82+4MZrskMQHCNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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