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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89afe17c4012c3e362c2aa7c1568dd4cb4a5190d3a3533c412badf4244a48b77' 
  AND token = '4ntBDydZAp38LIekTeAIrcxSOeKptSeC+vC+p9cqwzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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