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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2facf59154f1ea95e07a556c2253fc30d114890dace8a1259afc4995d378a718' 
  AND token = 'dbdDAjyVFo6PbEb/9aFv2XPjpwehHt4C37UjY8d0sY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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