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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a541ef6d4656ef5ca583df52a98106b8005b5c43ae52220be77d99afcdd57a0' 
  AND token = 'bIsW65erBCo6jf1xD+Wl16E/yDeTcL02DvuR81BQI3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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