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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a93e17bcb209246d107236132dd1fd90d4dadb824b57c49b39c8f94c20dc66' 
  AND token = '5PtWV2JqCXA2Mt7n+EBftY0t6hkipnzBt7+kPQmTCOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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