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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146cf4b799e34f4e315d44ecc9b0b1b717908980712024efe6877c18d1da879e' 
  AND token = 'XxhP4Au4UQFZN0hsGMpxBMxv/TGq/4yensiN9d0zQfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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