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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2426fa8b6bab4ad12bd982c53b9e72ae7a8c53c6f0e9c9361df8c5d2ebe5c87d' 
  AND token = 'OogCZr9G82YkrBE/Gu1FNzaSDNObbDpGzApOwfSNaos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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