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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14b1f271404d0b1f8722ac2910e01081d0352b3e9af07e0be131791b0180f8e' 
  AND token = '3o/qR3X7fmLiOsb31wZpcVdIyArBHUNNjhKJJQoMg2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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