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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd96928de85d3606f83b9e93a2b4a5efacbb5954882559a42082930c7c718f0' 
  AND token = 'Ud6vWFym3aLc0lcQMFfFBkIadP6sc8ENnHX86E5wf0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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