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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712cb2d8b70fab8c3703d8797b0f6a8fda003edf2c0d4298ec7ac88d9e8c7d78' 
  AND token = 'GVlqStgPkhHmPzZbh3gshY8pqCzzREwTqPQa6bQpUEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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