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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d9d5d57c2a47a2876cb7e6af907f6e4468b996b2349acd4aaecb06be7f64e9' 
  AND token = 'n4vO0Xud7x7gkMjO6HG0Z/W/WUAXa6MGoH1YPPP3rYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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