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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0f51a6f500b7b313b9ef195bbb8213db9c5e6dfe85c88c7eba54fa57ba104a' 
  AND token = 'yXLmh9HvnWPRoQ7aMeVolUcRwxkF65fBTby8o3E+/Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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