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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd473eb33e5760186aedd98d068b51ed795326e1e6c171d600b7d5a6816848f81' 
  AND token = 'GERNlB2Kca91yW8S9o14kYt7NR2Ab2G2Fb1/CAfh/Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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