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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61614685487226b348a36d44bd8e881cf7d359f145e603e28f4bda88c1f7a656' 
  AND token = 'TujfJg4EeEbifDPPm+uzOs53GC8rlxw1jmoc3rJe7rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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