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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e8a0bd49f56d160c44248c4f5f0d51d378c9f1ea6ffe3484fff62a89fc1c2f' 
  AND token = '2sb6nG2t+nzv0aFj9paxj2/4nhw48IMzG9wRa3nPJWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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