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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bf3a1b98d469ac113d99f0408363e7fb974f525689f41b1033abde3c8d494b' 
  AND token = 'iHifkVZl3L3X8/Xijrcvi0UTJNNylIm71jmlGHY7Lkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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