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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fe8dfd03f862e4483d31ef0f4004fa21e903405f8dc643fb9a8c05e68202a0' 
  AND token = 'bEvuoZ2jVcYqDsdAOLF1VMnhl82QANjVLFvTDnQIGFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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