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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e932cd832d9efc201de8a4248ee97e9b737c7ebd0296fced71671bc24d24bc8e' 
  AND token = '1SVhf9IKBIkieUheeRfKuX5KWn1fsJaP+id/7CC+xx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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