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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d2541fcc17c14199b50dc9149dd9ef015de13d34d8ffc4c8233706e913a2d3' 
  AND token = 'yv17N655euH5riuE0Pc5FzxY1GMXuXcVtghoaS5ZyAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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