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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf33f9616b9ebf73e64f765be69e2e93daa7b988e081e5246f3cac86e9086d8' 
  AND token = 't2KJALeucWQSw7J83QAPW+D6dM0OFwvDOq6jvP0Yl1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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