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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d268ae3b46aaf406da9d6785f59516c7946cadab2c472b812ea50f246b6405' 
  AND token = 'jx1wmqQqA5axgxIqMbdEXNFRUKi2Ewyx6vBXv4qL1Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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