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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd56c4db15863b4fdc5325e29f40f0661ba24d79a0beffbaeb40d30acbf2f05c' 
  AND token = 'P5J6+wVe4E8jfXc2oc0o7oUsOBDR2WvvxhrxbHu901s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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