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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f6c1895412958f2fff4f895472a76168ba1ef80c2cdb9e2c0f69ecd96479bd' 
  AND token = 'CW513SBGaZa5GCmfoInMwARTUCIFUYLA4qgB3gJsltA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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