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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c47d5fb5d1d0445f90ca10bd454ec7fa9cd93d10bb1b73e538be60b15de8762' 
  AND token = '39hRcJ4SWXtu3LYgd3Q0T83P9QKhhgPnMAYK2QS41gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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