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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663761a644bcc4debffe4ee992e5804845ed93835f4ef18dd44457d5add44fa2' 
  AND token = '2ZVOPwNdqQkXNp+ZxE5jFVqdx3PSjJHjp5Gl/inc1Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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