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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bcf513be568569c6a6502affa1cead8ea5d78671e57e439831d297d46d20d7' 
  AND token = 'LW59jTH8ewf3SqWFh+9h+VGMT9bdisn0TzuPDV79g64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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