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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7ba50b27aaa19b6c5796a20c302f355ded36718df6aba5fc9dd5cbb9a3400d' 
  AND token = 'G2unPN6F8IxE+9bhqx7bmCUyu9FLjK+6zEISnjadBFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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