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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1114d243b54e39cd4ad71a820213b395c829fc527cb250eb22acefee24e5f0f' 
  AND token = 'cRJ1VAO0dWqOoloqvhyGBddWQVvMHHr035JEe85wNvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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