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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e56c3a9888370521d46f194cdd1b6718aac05ae7ffc9a6c18e79b78df6e48b4' 
  AND token = 'y65/nLdvf7Io5CuwfkYH1dLgXeNkpEAllMjWkzi8FXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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