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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9bbdbf6b6108e243995a0a2f586dffdd05c1e9980e7b31f525c91fe14c8bef0' 
  AND token = '+ZxXkb18UBsPGNtTIMJqBAXgii692UhR+t/3KMNrbhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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