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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccd09b0361f179b878613e15ccf082961cca3036af859a506ebfc277d79406f' 
  AND token = 'Yw6a6uwm+ScWfnIpr5Y0Zufv2jBmy+tQxcQVZqVpqn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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