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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c5a6b08fe2c7375ceb95ebd6dd21f7cd11d15b5df1d8b3149ad4ad3a48a9e2' 
  AND token = 'SpuRWSV2StYXDUsE6mP7OaI37HaayjTrZ8WcS4YRAH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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