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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f702a4c97dd07c066528f04b81ffc786efb000d55531e7fdff87986d288736' 
  AND token = 'rxe8fqKtXAO+EGEdnauB2CKm+ah9E3sn/r986mkqzEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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