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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7232839bbff3e32e713a96ed0b4c03794f5ee068ef4ebc2ae9df5fd0d459da80' 
  AND token = '9miLim6Ws9GKvkX3Xuvu04XymW/Y/BVMxLdDMs/vBeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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