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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3b3dbcc7f6cfb3a937cb394069342f7a4265e903922fe039b18abec3b2bafe' 
  AND token = 'kseqNHmNokiVz3y6InH1U6e+dM4kPpSmt9btiaCB7zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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