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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa7cb301e4cb16948749789f32a3c059ffe403e13069caf27faacf3dc858405' 
  AND token = '6q5XJhTIn/C9s4hj30vnVueuiQN8XSgfURhDCdMy7NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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