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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e4bbadbe4fdccb5e0188abe0308d8b580b9f6711254f2af3521d14ee56d975' 
  AND token = 'VXuGnxVVMvxdbFjD0n+evKWvoo3bPcjIEZjG+68yHe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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